[The canonical Kakuro puzzle is played in a grid of filled and empty cells, "black" and "white" respectively. Puzzles are usually 16i—16 in size, although these dimensions can vary widely. Apart from the top row and leftmost column which are entirely black, the grid is divided into "entries" - lines of white cells - by the black cells. The black cells contain a diagonal slash from upper-left to lower-right and a number in one or both halves, such that each horizontal entry has a number in the black half-cell to its immediate left and each vertical entry has a number in the black half-cell immediately above it. These numbers, borrowing crossword terminology, are commonly called "clues". The object of the puzzle is to insert a digit from 1 to 9 inclusive into each white cell such that the sum of the numbers in each entry matches the clue associated with it and that no digit is duplicated in any entry. It is that lack of duplication that makes creating Kakuro puzzles with unique solutions possible, and which means solving a Kakuro puzzle involves investigating combinations more, compared to Sudoku in which the focus is on permutations. There is an unwritten rule for making Kakuro puzzles that each clue must have at least two numbers that add up to it. This is because including one number is mathematically trivial when solving Kakuro puzzles; one can simply disregard the number entirely and subtract it from the clue it indicates.]

k4kur0 is Freeware and licensed under GPL.

k4kur0 features:

Kakuro/Cross Sum games for various grid sizes

game creator generating puzzles with unique solution

game editor and game solver

allows to set pencilmarks

supports pointer-devices (Smartphones/PDA)

different display sizes (auto adjusting/zoom in/out)

autosave/load, load and save of games

undo/redo support

colors can be adjusted

helper: check puzzle (highlights correct/wrong cells)

helper: highlight clue-fields for sums with unique combination

helper: show a hint

helper: reveal specific digit

helper: signal wrong sums

helper: display solution

helper: show possible digit combinations for a sum

helper: mini-calculator for +/- operations

languages: english, german

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